Which has a neutral charge? an electron a molecule a proton an ion

This is Earth Science

Two to three days after seeding cells in new media, you will notice that the pH of cell culture medium, as monitored by phenol red, will change over time unless it is replaced.

Explain the difference between rotation and revolution. Then use these terms to explain how Earth, the moon, and the Sun move relative to one another.

7. Which of the following pairs of atoms are isotopes? a) C14 & N14 b) U235 & U238 c) C12 & C12 d) C12 & N14 e) None of the choices are correct

What can change the direction of a reversible reaction involving gases? A. Change in temperature B. Change in pressure C. Change in volume D. All the above E. None of the above

How do the population in a community depend on each other

Which of these is produced when fossil fuels are burned? A) oxygen Eliminate B) nitrogen C) hydrogen D) carbon dioxide

Predict the sign of ΔSsys for each of the following processes. Which are positive? (a) Gasoline vapors mix with air in a car engine. (b) Hot air expands. (c) Humidity condenses in cold air.

A system consists of two components, each of which must activate if the system is to activate. One component has a reliability of. 99. The other has a reliability of. 95. The components are independent of one another with respect to reliability.

Which of the following energy level changes for an electron is most energetic? 3 → 2 5 → 2 4 → 2

Is baking soda a element compound homogeneous mixture or heterogeneous mixture?